syscalls: getsockopt

kernel-src/arch/x86-64/syscall.asm

@@ -101,6 +101,7 @@ extern syscall_readv
 extern syscall_yield
 extern syscall_fstatvfs
 extern syscall_fstatvfsat
+extern syscall_getsockopt
 syscalltab:
 dq syscall_print
 dq syscall_mmap
@@ -204,7 +205,8 @@ dq syscall_readv
 dq syscall_yield
 dq syscall_fstatvfs
 dq syscall_fstatvfsat
-syscallcount equ 102
+dq syscall_getsockopt
+syscallcount equ 103
 section .text
 global arch_syscall_entry
 ; on entry:

kernel-src/arch/x86-64/syscalllog.c

@@ -8,7 +8,7 @@
 void arch_interrupt_disable();
 void arch_interrupt_enable();
 
-#define SYSCALL_COUNT 102
+#define SYSCALL_COUNT 103
 #define LOGSTR(x) arch_e9_puts(x)
 
 static char *name[] = {
@@ -114,6 +114,7 @@ static char *name[] = {
 	"yield",
 	"fstatvfs",
 	"fstatvfsat",
+	"getsockopt",
 };
 
 static char *args[] = {
@@ -219,6 +220,7 @@ static char *args[] = {
 	"N/A", // yield
 	"fd %d ustat %p", // fstatvfs
 	"dirfd %d path %s ustat %p flags %d", // fstatvfsat
+	"fd %d level %d optname %d optval %p optlen %p", // getsockopt
 };
 
 #endif

kernel-src/include/kernel/abi.h

@@ -98,9 +98,29 @@ typedef struct {
 #define MSG_WAITALL 0x100
 #define MSG_NOSIGNAL 0x4000
 
-#define SO_BROADCAST 6
+#define TCP_NODELAY 1
+#define TCP_KEEPIDLE 4
+#define TCP_KEEPINTVL 5
+
+#define IP_TOS 1
+
+#define SO_DEBUG        1
+#define SO_REUSEADDR    2
+#define SO_TYPE         3
+#define SO_ERROR        4
+#define SO_DONTROUTE    5
+#define SO_BROADCAST    6
+#define SO_SNDBUF       7
+#define SO_RCVBUF       8
+#define SO_KEEPALIVE    9
+#define SO_OOBINLINE    10
+#define SO_LINGER       13
+#define SO_RCVLOWAT     18
+#define SO_SNDLOWAT     19
 #define SO_BINDTODEVICE 25
-#define SO_KEEPALIVE 9
+#define SO_ACCEPTCONN   30
+#define SO_PROTOCOL     38
+#define SO_DOMAIN       39
 
 #define SOL_SOCKET 1
 

kernel-src/include/kernel/sock.h

@@ -73,7 +73,8 @@ typedef struct socketops_t {
 	int (*getpeername)(socket_t *socket, sockaddr_t *addr);
 	size_t (*datacount)(socket_t *socket);
 	void (*destroy)(socket_t *socket);
-	int (*setopt)(socket_t *socket, int optname, void *buffer, size_t len, cred_t *cred);
+	int (*setopt)(socket_t *socket, int layer, int optname, void *buffer, socklen_t len, cred_t *cred);
+	int (*getopt)(socket_t *socket, int layer, int optname, void *buffer, socklen_t *len, cred_t *cred);
 	int (*shutdown)(socket_t *socket, int how);
 } socketops_t;
 

kernel-src/sys/syscalls/getsockopt.c

@@ -0,0 +1,66 @@
+#include <kernel/syscalls.h>
+#include <kernel/sock.h>
+#include <kernel/abi.h>
+#include <kernel/file.h>
+#include <errno.h>
+
+syscallret_t syscall_getsockopt(context_t *, int fd, int level, int optname, void *val, socklen_t *len) {
+	syscallret_t ret = {
+		.ret = -1
+	};
+
+	if (!IS_USER_ADDRESS(val) || !IS_USER_ADDRESS(len)) {
+		ret.errno = EFAULT;
+	}
+
+	file_t *file = fd_get(fd);
+	if (file == NULL) {
+		ret.errno = EBADF;
+		return ret;
+	}
+
+	if (file->vnode->type != V_TYPE_SOCKET) {
+		ret.errno = ENOTSOCK;
+		goto cleanup;
+	}
+
+	socket_t *socket = SOCKFS_SOCKET_FROM_NODE(file->vnode); 
+
+	MUTEX_ACQUIRE(&socket->mutex);
+	if (level == SOL_SOCKET) {
+		// handle some general cases
+		switch (optname) {
+			case SO_ERROR: {
+				socklen_t l;
+				ret.errno = usercopy_fromuser(&l, len, sizeof(l));
+				if (ret.errno)
+					break;
+
+				if (l != 4) {
+					ret.errno = EINVAL;
+					break;
+				}
+
+				int error = socket->error;
+				ret.errno = usercopy_touser(val, &error, sizeof(error));
+				if (!ret.errno)
+					socket->error = 0;
+
+				break;
+			}
+			default: {
+				ret.errno = socket->ops->getopt ? socket->ops->getopt(socket, level, optname, val, len, &current_thread()->proc->cred) : ENOPROTOOPT;
+			}
+		}
+	} else {
+		ret.errno = socket->ops->getopt ? socket->ops->getopt(socket, level, optname, val, len, &current_thread()->proc->cred) : ENOPROTOOPT;
+	}
+
+	MUTEX_RELEASE(&socket->mutex);
+
+	cleanup:
+	ret.ret = ret.errno ? -1 : 0;
+
+	fd_release(file);
+	return ret;
+}